When operating my helicopter, the tail rotor belt flips over on the drive pulley so that the "nobby" face turns out rather than engaging with the indentations in the pulley. I can manually flip the belt to the correct side, but it will flip back during operation. What can/should I do about this?

The belt is not loose (too tight?). The belt path to the tail rotor is not exactly 90 degrees to the main shaft, but I know of no possible adjustment.

When operating my helicopter, the tail rotor belt flips over on the drive pulley so that the "nobby" face turns out rather than engaging with the indentations in the pulley. I can manually flip the belt to the correct side, but it will flip back during operation. What can/should I do about this?

The belt is not loose (too tight?). The belt path to the tail rotor is not exactly 90 degrees to the main shaft, but I know of no possible adjustment.

Art

I don't have an immediate answer for this; let me ask the factory when they return from their big hobby expo in china after April 11

After the belt problem first occurred, I had to replace the main gear and checked/reset the belt routing at that time. The problem reoccurred as indicated in the post. Since then, the tail boom was damaged from a blade strike and I disassembled and straightened the boom. Since reinstalling the belt I have flown it once without the reversal problem occuring.

After the belt problem first occurred, I had to replace the main gear and checked/reset the belt routing at that time. The problem reoccurred as indicated in the post. Since then, the tail boom was damaged from a blade strike and I disassembled and straightened the boom. Since reinstalling the belt I have flown it once without the reversal problem occuring.

Art

Sounds great. the problem might happen if the belt gets a "kink" in it or the belt has an inadvertent additional twist inside the tail boom or the tail boom has been bent causing the belt to be pinched or rubbing. Glad you got it working correctly.

[QUOTE=Parkflying;21241184]the problem might happen if the belt gets a "kink" in it or the belt has an inadvertent additional twist inside the tail boom or the tail boom has been bent causing the belt to be pinched or rubbing. QUOTE]

If that was the case, it happened at the factory since the problem started before any damage occurred. Then it continued after replacing the main gear (during which the belt routing was checked). Anyway, it has now stayed in place thru many flights since the last repairs, and I'm hoping to never observe this condition again. It may be that I have a little more tension on the belt than before.

the problem might happen if the belt gets a "kink" in it or the belt has an inadvertent additional twist inside the tail boom or the tail boom has been bent causing the belt to be pinched or rubbing. QUOTE]

If that was the case, it happened at the factory since the problem started before any damage occurred. Then it continued after replacing the main gear (during which the belt routing was checked). Anyway, it has now stayed in place thru many flights since the last repairs, and I'm hoping to never observe this condition again. It may be that I have a little more tension on the belt than before.

Yes lack of tension can allow the belt to twist over itself under certain conditions; as we bench test each helicopter before we ship, we have, in some cases, had to increase the tension on the belt